public class ReplacementTester
{
   public static void main(String[] args)
   {
      String greeting = "Hello, elite hacker!";
      // your work here 
      // call the replace method four times
      int l;
      l=greeting.length();
      String modifiedGreeting = "";
      for(int i=0;i<l;i++){
         char c=greeting.charAt(i);
         if(c=='e')
         c='3';
         else if(c=='i')
         c='1';
         else if(c=='l')
         c='7';
         else if(c=='o')
         c='0';
         modifiedGreeting+=c;
      }
      System.out.println(modifiedGreeting);
      System.out.println("Expected: H3770, 371t3 hack3r!");
   }
}